Mac OS X Lion does not install!!!

So I purchased Mac OS X Lion on the app store.  It began to download. When I clicked to install the new OS X LION it stops and says "It could not install because it could not be verified with apple.  Your download might have been corrupted during the download".  What the heck is going on.  I tried uninstalling it reinstalling it (as an apple technician told me to do so over the phone) and it didnt work.  I have all the spec requirements needed to upgrade to LION but still it will not download to my computer.  I paid 30 bucks for this upgrade and Apple will not refund me.  Can someone please help me!!!  Thanks.

If it has been corrupted during download then delete it and get a fresh copy.
Colin R.

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